let's pretend that A is the wisest man .
because no one get picked so there won't be two of the golden crown
A think that there's only one guy wearing the golden crown , and that's himself because they are all wise man , and if they saw the golden crown more than one , they won't sat their for the long time to realize they're not the one got picked
They need to see both the silver crown to make sure that they are getting picked
So there's gonna be only one crown
A will stand up and said : i'm wearing the golden crown